After watching a flash movie in fullscreen (for example on youtube) and then closing the fullscreen movie by pressing [esc], the tab containing the movie does not get "activated" again: the close/min/max buttons and the scrollbar are greyed out like with a background window, the window itself has the darker grey of an active window though. Commands like Cmd-W to close the tab seem to go to the window, rather than the tab that is supposed to be active ("This window contains X tabs, do you really want to close it?"). This might be a bug in safari and not webkit, not sure when it started exactly…
<rdar://problem/6367288>
This bug is in a component outside of WebKit. Closing as INVALID to indicate that it is a non-WebKit bug.
*** Bug 22311 has been marked as a duplicate of this bug. ***